HMV gramophone, 1923.
© Science Museum / Science & Society Picture Library
Table grand model, fitted with Lumiere pleated diaphragms (patented in 1909 in the UK). The diaphragm was fragile, and its superiority over ordinary internal horn machines was slight. The diaphragm model was a short-lived and expensive item but nevertheles sold well, The arrival in 1925 of electric recording (and the need for new machines to cope with the new records) spelled the end for the pleated diaphragm gramophones.